Ultrafast charge transfer and coherent phonons in electroactive organic cation-templated low-dimensional perovskite analogues
Year: 2025
Type: article
Abstract: ]carbazole (DBCz) as a novel electroactive organic cation that enables the formation of two distinct low-dimensional hybrid metal halides: a conventional 2D perovskite structure, (DBCz)2PbI4, and a previously unreported layered perovskite analogue structure with edge-sharing octahedra, DBCzPbI3. The edge-sharing phase represents a new structural motif within the hybrid metal halide family. Both materials exhibit a type-II band alignment, facilitating ultrafast photoinduced hole transfer from the inorganic to the organic layer. Using transient absorption spectroscopy, we identify the formation of DBCz-based hole polarons in both phases, and uniquely observe the charge-transfer-induced formation of triplet states and room-temperature coherent phonons for the perovskite analogue phase. These findings highlight the role of molecular design in controlling excited-state dynamics and exciton-lattice interactions in hybrid metal halides.
Source: Nanoscale Horizons
DOI: 10.1039/d5nh00494b
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G1121524816, G1684323015, Tailored crystals on-demand: gaining a full understanding of the crystallization of low-dimsional hybrid perovskites., G2628959814, Towards the design and synthesis of quasi-2D Sn-containing perovskites with an enhanced stability for the development of efficient all-perovskite tandem solar cells, G367224153, G3837786636, G4298533165, G4776098613, Hybrid perovskites with a twist: inducing chirality towards circularly polarized light emission, G722552297, G732969837, G7443847719, Platform for liquid and solid state Nuclear Magnetic Resonance (NMR) spectroscopy, sINglet and Triplet Energy traNSfer In Two-dimensional hYbrid perovskites (INTENSITY)
OpenAlex ID: W4415245193